North Korea could hold nuclear test next week, US envoy warns

US says Pyongyang may escalate recent provocations with a weapons test on 110th anniversary of founder Kim Il-sung's birth

North Korea could be planning its first nuclear weapon test in nearly five years, according to a senior US official who urged the regime to step back from further provocations following its recent long-range missile test.

Sung Kim, the special representative for North Korea policy at the US state department, said Washington believes Pyongyang could demonstrate its growing nuclear weapons capacity on 15 April, an annual holiday held to celebrate the 110th anniversary of the birth of the country's founder, Kim Il-sung.